It was a result that has renewed doubts about Argentina's ability to mount a sustained challenge at this World Cup, four years after they reached the final in Brazil.

Another adverse outcome on Thursday and many may even start to consider the unthinkable - that Argentina could be on their way out at the group stage, mirroring their shock first round exit in 2002.

Diego Maradona called the Iceland result a "disgrace" and warned manager Jorge Sampaoli he would not be able to return to Argentina with similar performances.

Adding to the sense of disappointment, Messi's missed penalty was accompanied by 11 unsuccessful shots, the most in a World Cup game without return by a single player since Italy's Luigi Riva in 1970.

Argentina's players however have been quick to close ranks around the Barcelona superstar.

Angel Di Maria, left, and Paulo Dybala play ball during a training session of Argentina on the eve of their group D match against Iceland at the 2018 soccer World Cup in Bronnitsy, Russia, Friday, June 15, 2018. (AP Photo/Ricardo Mazalan)

"We are all with him, he knows that he can count on the support of all of us more than ever," Argentina striker Paulo Dybala said. "We are here to help him every moment, and of course we will be at his side."

"We all know what Messi represents to our team and to our country," Ansaldi said. "Not only is he the best player in the world on the pitch, he is also best player off the field. He's in good shape and that's good for us."

Despite the solitary point against Iceland, Argentina can take solace from a performance which saw them muster 26 shots and have 72 per cent possession against Iceland.

Sampaoli is reportedly considering several changes for the game, including drafting in young forward Cristian Pavon for Angel di Maria for more creativity up front.

Similarly in midfield, Paris Saint-Germain's Giovani lo Celso could start as Argentina seek more attacking options, possibly at the expense of Lucas Biglia.

Their jobs would be to supply Messi and goalscorer against Iceland Sergio Aguero with the kind of service on which they would thrive in a potential 3-3-3-1 formation.